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-rw-r--r--src/libs/cplusplus/ExpressionUnderCursor.cpp175
-rw-r--r--src/libs/cplusplus/ExpressionUnderCursor.h10
-rw-r--r--src/libs/cplusplus/SimpleLexer.h7
3 files changed, 112 insertions, 80 deletions
diff --git a/src/libs/cplusplus/ExpressionUnderCursor.cpp b/src/libs/cplusplus/ExpressionUnderCursor.cpp
index 53dc9b4f2d..aab83d5377 100644
--- a/src/libs/cplusplus/ExpressionUnderCursor.cpp
+++ b/src/libs/cplusplus/ExpressionUnderCursor.cpp
@@ -36,13 +36,100 @@
using namespace CPlusPlus;
+namespace CPlusPlus {
+
+class BackwardsScanner
+{
+ enum { MAX_BLOCK_COUNT = 10 };
+
+public:
+ BackwardsScanner(const QTextCursor &cursor)
+ : _offset(0)
+ , _blocksTokenized(0)
+ , _block(cursor.block())
+ {
+ _tokenize.setSkipComments(true);
+ _text = _block.text().left(cursor.position() - cursor.block().position());
+ _tokens.append(_tokenize(_text, previousBlockState(_block)));
+ }
+
+ QList<SimpleToken> tokens() const { return _tokens; }
+
+ const SimpleToken &operator[](int i)
+ {
+ while (_offset + i < 0) {
+ _block = _block.previous();
+ if (_blocksTokenized == MAX_BLOCK_COUNT || !_block.isValid()) {
+ ++_offset;
+ _tokens.prepend(SimpleToken()); // sentinel
+ break;
+ } else {
+ ++_blocksTokenized;
+
+ QString blockText = _block.text();
+ _text.prepend(blockText);
+ QList<SimpleToken> adaptedTokens;
+ for (int i = 0; i < _tokens.size(); ++i) {
+ const SimpleToken &t = _tokens.at(i);
+ const int position = t.position() + blockText.length();
+ adaptedTokens.append(SimpleToken(t.kind(),
+ position,
+ t.length(),
+ _text.midRef(position, t.length())));
+ }
+
+ _tokens = _tokenize(blockText, previousBlockState(_block));
+ _offset += _tokens.size();
+ _tokens += adaptedTokens;
+ }
+ }
+
+ return _tokens.at(_offset + i);
+ }
+
+ int startPosition() const
+ { return _block.position(); }
+
+ const QString &text() const
+ { return _text; }
+
+ QString text(int begin, int end) const
+ {
+ const SimpleToken &firstToken = _tokens.at(begin + _offset);
+ const SimpleToken &lastToken = _tokens.at(end + _offset - 1);
+ return _text.mid(firstToken.begin(), lastToken.end() - firstToken.begin());
+ }
+
+ int previousBlockState(const QTextBlock &block)
+ {
+ const QTextBlock prevBlock = block.previous();
+ if (prevBlock.isValid()) {
+ int state = prevBlock.userState();
+
+ if (state != -1)
+ return state;
+ }
+ return 0;
+ }
+
+private:
+ QList<SimpleToken> _tokens;
+ int _offset;
+ int _blocksTokenized;
+ QTextBlock _block;
+ QString _text;
+ SimpleLexer _tokenize;
+};
+
+}
+
ExpressionUnderCursor::ExpressionUnderCursor()
{ }
ExpressionUnderCursor::~ExpressionUnderCursor()
{ }
-int ExpressionUnderCursor::startOfMatchingBrace(const QList<SimpleToken> &tk, int index)
+int ExpressionUnderCursor::startOfMatchingBrace(BackwardsScanner &tk, int index)
{
if (tk[index - 1].is(T_RPAREN)) {
int i = index - 1;
@@ -54,7 +141,7 @@ int ExpressionUnderCursor::startOfMatchingBrace(const QList<SimpleToken> &tk, in
} else if (tk[i].is(T_RPAREN))
--count;
--i;
- } while (count != 0 && i > -1);
+ } while (count != 0 && tk[i].isNot(T_EOF_SYMBOL));
} else if (tk[index - 1].is(T_RBRACKET)) {
int i = index - 1;
int count = 0;
@@ -65,7 +152,7 @@ int ExpressionUnderCursor::startOfMatchingBrace(const QList<SimpleToken> &tk, in
} else if (tk[i].is(T_RBRACKET))
--count;
--i;
- } while (count != 0 && i > -1);
+ } while (count != 0 && tk[i].isNot(T_EOF_SYMBOL));
} else if (tk[index - 1].is(T_GREATER)) {
int i = index - 1;
int count = 0;
@@ -76,13 +163,13 @@ int ExpressionUnderCursor::startOfMatchingBrace(const QList<SimpleToken> &tk, in
} else if (tk[i].is(T_GREATER))
--count;
--i;
- } while (count != 0 && i > -1);
+ } while (count != 0 && tk[i].isNot(T_EOF_SYMBOL));
}
return index;
}
-int ExpressionUnderCursor::startOfExpression(const QList<SimpleToken> &tk, int index)
+int ExpressionUnderCursor::startOfExpression(BackwardsScanner &tk, int index)
{
// tk is a reference to a const QList. So, don't worry about [] access.
// ### TODO implement multiline support. It should be pretty easy.
@@ -178,95 +265,37 @@ bool ExpressionUnderCursor::isAccessToken(const SimpleToken &tk)
} // switch
}
-int ExpressionUnderCursor::previousBlockState(const QTextBlock &block)
-{
- const QTextBlock prevBlock = block.previous();
- if (prevBlock.isValid()) {
- int state = prevBlock.userState();
-
- if (state != -1)
- return state;
- }
- return 0;
-}
-
-void ExpressionUnderCursor::init(const QTextCursor &cursor,
- QList<SimpleToken> *tokens,
- QString *text,
- int *startPosition)
-{
- enum { MAX_BLOCK_COUNT = 5 };
-
- QTextBlock block = cursor.block();
- QTextBlock initialBlock = block;
- for (int i = 0; i < MAX_BLOCK_COUNT; ++i) {
- if (! initialBlock.previous().isValid())
- break;
-
- initialBlock = initialBlock.previous();
- }
-
- QTextBlock it = initialBlock;
- for (; it.isValid(); it = it.next()) {
- QString textBlock = it.text();
-
- if (it == block)
- textBlock = textBlock.left(cursor.position() - cursor.block().position());
-
- text->append(textBlock);
-
- if (it == block)
- break;
-
- text->append(QLatin1Char('\n'));
- }
-
- SimpleLexer tokenize;
- tokenize.setSkipComments(true);
- tokens->append(tokenize(*text, previousBlockState(initialBlock)));
- tokens->prepend(SimpleToken()); // sentinel
-
- if (startPosition)
- *startPosition = initialBlock.position();
-}
-
QString ExpressionUnderCursor::operator()(const QTextCursor &cursor)
{
- QList<SimpleToken> tokens;
- QString text;
-
- init(cursor, &tokens, &text);
+ BackwardsScanner scanner(cursor);
_jumpedComma = false;
- const int i = startOfExpression(tokens, tokens.size());
- if (i == tokens.size())
+ const int initialSize = scanner.tokens().size();
+ const int i = startOfExpression(scanner, initialSize);
+ if (i == initialSize)
return QString();
- return text.mid(tokens.at(i).position(),
- tokens.last().position() + tokens.last().length()
- - tokens.at(i).position());
+ return scanner.text(i, initialSize);
}
int ExpressionUnderCursor::startOfFunctionCall(const QTextCursor &cursor)
{
- QList<SimpleToken> tokens;
QString text;
- int startPosition;
- init(cursor, &tokens, &text, &startPosition);
+ BackwardsScanner scanner(cursor);
- int index = tokens.size();
+ int index = scanner.tokens().size();
forever {
- const SimpleToken &tk = tokens.at(index - 1);
+ const SimpleToken &tk = scanner[index - 1];
if (tk.is(T_EOF_SYMBOL))
break;
else if (tk.is(T_LPAREN))
- return startPosition + tk.position();
+ return scanner.startPosition() + tk.position();
else if (tk.is(T_RPAREN)) {
- int matchingBrace = startOfMatchingBrace(tokens, index);
+ int matchingBrace = startOfMatchingBrace(scanner, index);
if (matchingBrace == index) // If no matching brace found
return -1;
diff --git a/src/libs/cplusplus/ExpressionUnderCursor.h b/src/libs/cplusplus/ExpressionUnderCursor.h
index dda77c406c..1214d08902 100644
--- a/src/libs/cplusplus/ExpressionUnderCursor.h
+++ b/src/libs/cplusplus/ExpressionUnderCursor.h
@@ -41,6 +41,7 @@ QT_END_NAMESPACE
namespace CPlusPlus {
+class BackwardsScanner;
class SimpleToken;
class CPLUSPLUS_EXPORT ExpressionUnderCursor
@@ -53,13 +54,8 @@ public:
int startOfFunctionCall(const QTextCursor &cursor);
private:
- void init(const QTextCursor &cursor,
- QList<SimpleToken> *tokens,
- QString *text,
- int *startPosition = 0);
-
- int startOfMatchingBrace(const QList<SimpleToken> &tk, int index);
- int startOfExpression(const QList<SimpleToken> &tk, int index);
+ int startOfMatchingBrace(BackwardsScanner &tk, int index);
+ int startOfExpression(BackwardsScanner &tk, int index);
int previousBlockState(const QTextBlock &block);
bool isAccessToken(const SimpleToken &tk);
diff --git a/src/libs/cplusplus/SimpleLexer.h b/src/libs/cplusplus/SimpleLexer.h
index 0366738c6b..666478016a 100644
--- a/src/libs/cplusplus/SimpleLexer.h
+++ b/src/libs/cplusplus/SimpleLexer.h
@@ -41,6 +41,13 @@ class SimpleLexer;
class CPLUSPLUS_EXPORT SimpleToken
{
public:
+ SimpleToken(int kind, int position, int length, const QStringRef &text)
+ : _kind(kind)
+ , _position(position)
+ , _length(length)
+ , _text(text)
+ { }
+
SimpleToken()
: _kind(0),
_position(0),
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